Here are some corrections in your post -Last week my English(English with always capital E) teacher taught(there is no word like 'teached' in english, teach becomes taught in past tense)us('our' is used in possessive case; Example - "I learnt it in our English class" and 'us' is used as an object) the subjunctive moodI can't understand some rules (formula exists in Maths and rules in English), I think it is complicated. Tell me something about it.